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[Bug sanitizer/63927] AddressSanitizer painfully slow on ppc64
- From: "pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 18 Nov 2014 18:25:33 +0000
- Subject: [Bug sanitizer/63927] AddressSanitizer painfully slow on ppc64
- Auto-submitted: auto-generated
- References: <bug-63927-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63927
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Kostya Serebryany from comment #4)
> Why can't we use frame pointers on PPC?
You don't need to use the frame pointer. The ABI says the stack frame always
contains a reference to the previous frame at a specific location (I think
sp+0).
> So far I have not seen any implementation of unwinder not based on FPs
> that was fast enough for ASan.
> ASan unwinds the stack on every malloc/free and thus it is very sensitive to
> the unwinder performance.